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Strategies for Enhancement in Food Production · Question 39

AIPMT 2007MCQEasy📈 Topic in 0% papers+4−1
1

In maize, hybrid vigour is exploited by:-

  1. Crossing of two inbred parental lines
  2. Bombarding the seeds with DNA
  3. Harvesting seeds from the most productive plants
  4. Inducing mutations

Answer

(1) Crossing of two inbred parental lines

Solution

Hybrid vigour (heterosis) is the superiority of the F1 hybrid over both its parents in yield, size and vigour.

⇒ In maize, pure (inbred) lines are first developed by repeated self-pollination for several generations.

⇒ Two such inbred parental lines are then crossed; the F1 hybrid shows maximum heterosis and gives high yield.

∵ Heterosis is lost in later generations, fresh hybrid seed is produced every season by crossing the inbred lines again.

∴ Hybrid vigour in maize is exploited by crossing two inbred parental lines.

Answer: (1)

Out of syllabusAIPMT 2007

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2

Crop plants grown in monoculture are-

  1. Characterised by poor root system
  2. Highly prone to pests
  3. Low in yield
  4. Free from intraspecific competition
Out of syllabusAIPMT 2006
3

In Maize, hybrid vigour is exploited by-

  1. Crossing of two inbred parental lines
  2. Inducing mutations
  3. Harvesting seeds from the most productive plants
  4. Bombarding the protoplast with DNA
Out of syllabusAIPMT 2006
4

In order to obtain virus-free plants through tissue culture the best method is-

  1. Anther culture
  2. Protoplast culture
  3. Meristem culture
  4. Embryo rescue
Out of syllabusAIPMT 2006
5

Triticale, the first man-made cereal crop, has been obtained by crossing wheat with

  1. Pearl millet
  2. Sugarcane
  3. Rye
  4. Barley
Out of syllabusAIPMT 2006
6

The world's highly prized wool yielding 'Pashmina' breed is -

  1. Sheep
  2. Goat-sheep cross
  3. Kashmir sheep-Afghan sheep cross
  4. Goat
AIPMT 2005
7

Three crops that contribute maximum to global food grain production are -

  1. Wheat, maize and sorghum
  2. Wheat, rice and barley
  3. Wheat, rice and maize
  4. Rice, maize and sorghum
Out of syllabusAIPMT 2005
8

Which of the following is generally used for induced mutagenesis in crop plants ?

  1. UV (260 nm)
  2. Alpha particles
  3. Gamma rays (from cobalt-60)
  4. X-rays
Out of syllabusAIPMT 2005
9

The name of Norman Borlaug is associated with-

  1. Blue Revolution
  2. Yellow Revolution
  3. Green Revolution
  4. White Revolution
Out of syllabusAIPMT 2005
10

The technique of obtaining large number of plantlets by tissue culture method is called –

  1. Macropropagation
  2. Organ culture
  3. Plantlet culture
  4. Micropropagation
Out of syllabusAIPMT 2004
11

India's wheat yield revolution in the 1960s was possible primarily due to :-

  1. Hybrid seeds
  2. Quantitative trait mutations
  3. Increased chlorophyll content
  4. Mutations resulting in plant height reduction
Out of syllabusAIPMT 2004

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